sdreynolds opened a new pull request #1589: [CALCITE-3508] Strengthen Outer Joins based on FILTER clauses URL: https://github.com/apache/calcite/pull/1589 This change expands upon `FilterJoinRule` ability to strengthen JOINs by leveraging the filter clauses within the query. For a JOIN that is nullable on either the left or the right, this change inspects the Filter clauses of the query to determine if it is possible to strengthen the JOIN.
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